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4 x Cisco 2500 routers

• 
  

  each router has one Ethernet and two serial interfaces

  
  
• one of the 2500’s, router1, has an ISDN BRI interface
  

1 x Cisco 2600 router (identified as router2)

• 
  

  has one Ethernet interface

  
  
• has both an ISDN BRI and a PRI interface
  

2 x Catalyst 1912 switches

• 
  

  each switch has twelve 10baseT and two Fast Ethernet ports

2 X Catalyst 2950 switches

• 
  

  each switch has twelve 10/100 Ethernet ports

2 x  PC’s